erachima
Explorer
I ran and played 4E for a solid four years, so do me a favor and don't tell me my experience wasn't what it was. It may have worked one way for you, but that doesn't make it the same for everybody.
I don't think I ever saw an ambush turn a serious fight into a curbstomp. What I found was that surprise just made a curbstomp faster that was going to happen anyhow. Sure, maybe it saved the party a healing surge or two, but that was it. A tough fight was a little less tough if you got surprise, but it wasn't easy.
If you played for four years and couldn't fix your combat lengths, then that's certainly your experience, but your experience certainly doesn't attest well to your advice-giving qualifications on the subject.
The average (non-waved) combat length is 2-4 rounds, a surprise round reduces that to about 1.5 and generally trivializes the fight.